Spring Boot使用注解实现AOP

　　　　　<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

package com.zdst.scs.web.controller.interact.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import org.springframework.ui.Model;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * 这个切面类的功能是给方法的Model添加参数
 * 切点表达式匹配的是两个, 如果只有一个可以去掉 || 及后面的表达式,匹配条件变成一个
 */
@Aspect
@Component
public class  aop {
　　//切点表达式意义自行百度 注意,指定到方法和指定类下所有方法  这两种情况的表达式不同
　　//指定到方法: public * com.web.controller.UserController.aop*(..)) UserController类中以aop开头的方法
   //  指定到类: public * com.web.controller.UserController.*.*(..))   UserController类中的所有方法
    @Pointcut("execution(public * com.web.controller.UserController.aop*(..)) || "
            + "execution(public * com.web.controller.AnotherController.aop*(..))")
    public void token(){}
    /**
     * 添加token
     */
    @Before("token()")
    public void doBefore(JoinPoint joinPoint){
        
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();//获取request请求
        HttpSession session = (HttpSession)request.getSession();//获取session
        String token=(String)session.getAttribute("token");//获取session存储的属性值      
        
        Object[] obj = joinPoint.getArgs();//获取目标方法参数信息
        for (Object argItem : obj) {
            if (argItem instanceof Model) {
                Model model = (Model) argItem;
                model.addAttribute("token",token);//设置参数内容
            }
        }
    }

    //目标方法执行完后执行
    @After("token()")
    public void doAfter(){
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        System.out.println(request.getAttributeNames());
    }
　　//获取目标方法返回数据后执行
    @AfterReturning(returning = "object",pointcut = "token()")
    public void doAfterReturn(Object object){
        System.out.println(object.toString());
    }
     
}